A simple hand drill, small enough to store inside your drill bit case.  Insert #10-24 nuts and machines screws, insert drill bit, tighten.

There are two versions.  I'd recommend the one created through TinkerCAD, the v8.1.  The other created through OpenSCAD works, but the TinkerCAD model is smaller, flatter, prints faster, and had a better fit for all the parts.

I needed a drill, so I designed and printed a drill.

Full blog post write up:  [http://shor.tw/1eg](http://shor.tw/1eg)